Hubungan asupan zink, kalsium dan sosial ekonomi keluarga dengan prestasi belajar siswa usia 13-15 tahun di SMP Nabil Husein Samarinda: The relationship between zinc and calcium intake and family socioeconomic status with academic achievement of 13-15 year old students at SMP Nabil Husein Samarinda. Widya Kesehatan, v. 5, n. 1, p. 41–49, 12 May2023.